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8 p.m. CDT Thursday, June 21, 2007
Mission Control Center, Houston, Texas
STS-117 MCC Status Report #28
The exact times of Friday landing opportunities for the Space Shuttle Atlantis and its crew changed slightly following a brief engine firing that adjusted the spacecraft’s orbit. The adjustment makes possible a California landing opportunity earlier in the day before winds are expected to increase.

Poor weather prevented Atlantis’ astronauts from landing today at the Kennedy Space Center in Florida. The crew was waved off from its second and final landing attempt at 12:38 p.m. CDT when Mission Control sent word that rain showers were within 30 miles of the center accompanied by low clouds.

Shortly after the weather wave off, Entry Flight Director Norm Knight directed support for the backup landing site Friday at Edwards Air Force Base. Knight said he intends to bring Atlantis home Friday to either Kennedy or Edwards.

There are multiple deorbit opportunities available for Atlantis’ astronauts Friday. The Florida weather forecast includes the possibility for more thundershowers. The Edwards forecast is favorable.

On Friday, landing preparations begin at 8:12 a.m. CDT, and the crew should close the payload bay doors at 9:32 a.m. Here are predicted times for tomorrow’s landing opportunities (all CDT):

218 Kennedy 12:12 p.m. 1:18 p.m.
219 Edwards 1:43 p.m. 2:49 p.m.
  Kennedy 1:50 p.m. 2:55 p.m.
220 Edwards 3:18 p.m. 4:23 p.m.
221 Edwards 4:56 p.m. 5:59 p.m.

The next STS-117 status report will be issued Friday morning after crew wake up, or earlier if events warrant.